Air or other fluid-pressure pump.



W. B. HLKINGTGN.

'AIR 0R OTHER FLUID PRESSURE PUMP.

APPLICATION FILD MN. 25. i915.

19155553., Patented Nov. 16, 1915.

3 SHEETS-SHEET l.

JMW-54,.

w. R. HLKINGTQN.

Am 0R OTHER mu PRESSURE PUMP.

N APPLICATION FILED JAH. 25, 9i5. lvlng, Patented Nov. 16, 1915.

3 SHEETS-SHEET 2.

W. R. PIIKINGTN.

AIR 0R OTHER FLUID PRESSURE PUMP.

AIPIJCATION FILED IAN. 25, IBIS. 1,1052@ .Patented Nov. 16, IIII.

3 SHEETS-SHEET 3.

I LII' lll latory loted at one side arr. on OTHER FLUID-:PRESSURE Pour.

Application lcd'anuary 25, i915.

"luidPressure Pumps, of which the following is a specification.

This invention relates to a foot operated air or other fluid pressure pump that is priinarillyy intended for inlating the tires of motor or other vehicles, andthe invention consists in the combination of a treadle pivof frame or base, an oscilcylinder pivoted at the other end of the frame or hasewith its piston rod making a toggle joint with thetreadle, and a spring for normally retainingr the treadle and cyl-Y inder in their raised or normal position.

In the accompanying drawings :--Figure 1 is a side elevation of a pump constructed in accordance with this invention. Fig. 2 is a 51de elevation showing the pump in its 3 1s plan. Fig. 4 an closed vp'oeition. Fig. invertedfplan and Fig. i3 an end viewof the pump. Fig.4 6 is a side eleranon and Fig. i e plan of a. modified form of pump. A. indicates the pump cylinder, B, B, indicate two levers which constitute the treadle and are operatively connected with the pump piston and C indicates the Iframe ofthe Pump i In the example shown the cylinder A 1s pivoted at a to the base or frame which may be constructed of aluminium, aluminium alloy or other material. Pii'oted at b to the(A base or :trarne C are two arms orl levers IB, B, these levers are connected at their outer end with a cross piece, /l which may be itted with india rubber studs or be otherwise constructed. to prevent the foot from slipping therefronji whenvthe apparatus ,is in use. The arms or levers B. l. extend over the top of the cylindei-A and their free ends are conveniently'cranked vat to vsuit the position usually assumed by the foot during the pumping operation. 'The piston rod al is connected at its outer end with a cross head a! which is pivoted hetu'een the arms or levers B, B. to allow the angular movement of such arms and the piston rod, and in order to retain such parts in their raised or normal position a, spring is connected at one end to a rod b5 extending between two cranlfed portions b oi' the arms or levers Specification of Letters atenh in use, or if desired Serial No. 4,353.

yli, B'. iThe outer end of thes'pringis cross bar o in the frame C by aj; bolt b? which passes through .a holein such nected to a cross bah* an secured bya nut 68.

this arrangement the pull exertedb'f\ .t,h e.y

spring (f upon the arms or levers B,

v I man'. he regulated as required.

Fig. l the piston Patentedhov. 316,

eriurre .arnur oirri'cn.

winnaar nennen rimm.auzulsoli,` or nennen BRIDGE. einen rnns'rofu,

When theleversf.; f are 1n their raised posltion as shown in..v or plunger is atfthe outer end of its stroke and as the arms are forcedf) downward against the action of the `springV 'if' the piston I is forced to the its stroke Wit by the cyhnder A and the B, B. v When released, the spring the normaler original returns theA position; The *frame or base may be formed with stopsgf 5 limit the downward movement of the 'levers B, B, and may have cavities formed :inf its' underside to receive india rubber or other pads for preventing the pump from shifting on the ground, loor or other surface when its under surface may be roughencd and be provided with points or other devices for eecting such purpose. The pump cylinder is as usual provided 'with a non-return Valve and carries a pressure gage D communicating withy the cylinder and with the connecting pipe d.

lf desired a. Whistle or other indicator may lie-fitted for directing the attention of the operator when the tire is pumped to the required pressure. A,

illhen the pump ienot in use it may be retained in its closed position as shown in Fig. This is conveniently effected hy a link 59 pivoted at c2 to the frame C and having an inclined slot H to engage zin-annular groove frs in a pin (L4 projecting from the rcross head ai. the inclination ot' the slot bw and the position of the pivot c2 being; suclvil that when the pressure is exerted in a downward direction upon the cnoss piece L the pin a* pushes the link 6 against a stop a on the frame C and upon releasing the pressure on the cross piece b1 the pa rts assume operating' f @rms ik the pressure upon the latter ifsif" parte tov to one side whereupon it fallsv lOO with an arm B1, pivoted at its free end to a trunk piston'oii vand such arm is curved as Shown in Fig. G so that it will not bind against the piston as the latter is moved throughout its complete. stroke. Rigidlv rconnectedvvithzthe armsB, B1 is an arm Z1" .similar to that shown in'Figs. 1 and 2 and srch arm is connected to one end of a spring wb* of which the'other end is connected by a bolt b7 and nut bsto an arm a. forming part of' or rigidly connected with the cylinder A.

. In this example the lpivot a' for the cylinder A .is situated about the middleof the frame C and thev lever B is of such va length that it willclear the end C1 of the frame when the lever. B is moved'throu'gh a full stroke. The

modification above described may be fitted with a link such as b9 (see Figs. 1 and 2) for retaining the pump 'in its closed position.

By constructing a pump inl this manner -greatleverage is obtained and the pump occupies avery small amount of space when in its closed position.

The details of construction can be varously modified without'departing from the nature of the invention, for example, inA some cases 1t 'may beyconvenient to construct the pump cylinder with the operating arms and moose@ if desired the cylinder and arms may be retained in their normal position by a pneumatic spring which might be combined with the piston rod or he arranged separately therefrom.

'W hat claim by my' invention and desire vto' secure by Letters Patent in the United States is v Ain an air pump, -a supporting frame, a pump c vlinder pivoted to the frame and provided with a piston, an operating lever formed of av `pair of arms pivoted to the, frame and operatively connected vvlth the pump piston and arranged to straddle the cylinder, said lever arms having lugs at their l In testimony whereof l aliix my signature in presence of two witnesses. A

' WILLIAM RENRD lILKINGTON. WVtnesses z B. D. DAWSON, J. H.' Knorr. 

